화학공학소재연구정보센터
Journal of the Electrochemical Society, Vol.163, No.14, C864-C872, 2016
Evidence for an Unusual Temperature Dependence of the Atmospheric Corrosion of Zinc
The atmospheric corrosion behavior of zinc in the presence of NaCl has been investigated using well-controlled laboratory exposures in 95% RH air at ten different temperatures in the range -4 to 22 degrees C. Results show that a critical temperature (similar to -0.5 degrees C) exists in zinc corrosion above which the rate of corrosion is constant/independent of temperature, and, below which there is a positive correlation between temperature and corrosion rate. The corrosion products formed above and below -0.5 degrees C are also entirely different. While simonkolleite, hydrozincite and zinc carbonate hydroxide are the main corrosion products at T >= -0.5 degrees C, the same compounds are absent at T < -0.5 degrees C. Instead, sodium zinc carbonate (Na2Zn3(CO3)(4)center dot 3H(2)O) is the dominant corrosion product at low temperature, together with Na2ZnCl4 center dot 3H(2)O and sweetite (Zn(OH)(2)). The results are interpreted in terms of two distinct corrosion modes prevailing at "high" and "low" temperature, respectively. (C) The Author(s) 2016. Published by ECS. All rights reserved.